Rambus RMBS Insider Ownership

NASDAQ RMBS

$85.65 -0.08 (-0.09%)

At close: Oct 23, 2026 · 4:00 PM EDT

Insider Holdings by Owner

914.17K Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.761%

▼-0.0092% pp QoQ

Shares Held by Insiders

825.67K

filed for Sep 2026

▼-1.20% QoQ

Shares Outstanding

108.46Mn

108,461,603 shares

Direct Holdings

797.70K

Indirect: 27.97K

Net Shares Traded (QoQ)

-10.00K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 22, 2026

Over the past 12 months, Rambus insiders sold $21.01 million of stock on the open market (169.47K shares) and made no open-market purchases.

Behind Rambus' open-market sales in the past 12 months were 10 insiders, and no insider bought.
Xianzhi Sean Fan (EVP, COO) sold the most Rambus stock on the open market over the past 12 months, $5.75 million (37.91K shares), most recently on May 26, 2026.
The latest open-market trade on record is a sale of 5K shares for $555,000 by Charles Kissner (Director) on October 2, 2026.
Away from the open market, RMBS insiders received 451.34K shares in stock awards, gave up 243.59K shares to cover taxes or exercise prices and gave away 600 shares as gifts over the last 12 months.
Business Quant data shows Rambus insiders holding 820.66K shares in total in their latest Form 4 filings, down 1.79% from 835.66K shares at the end of Q2 2026 and up 5.45% from 778.22K shares at the end of Q3 2025.
By type of ownership, RMBS insiders hold 97.20% of their shares directly (797.7K shares) and 2.80% indirectly (22.96K shares).
Holdings in Rambus stock are reported by 13 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
RMBS's three largest insider shareholders, per their latest Form 4 filings, are Luc Seraphin (President and CEO, 345.77K shares), Xianzhi Sean Fan (EVP, COO, 168.36K shares) and Desmond Lynch (SVP, CFO, 63.62K shares).
Luc Seraphin holds 42.13% of the combined insider position in Rambus.
Institutions held 92.57% of Rambus' outstanding shares in their Q2 2026 13F filings, insiders about 0.76% based on their latest Form 4 filings, and other investors, including the public, the remaining 6.67%.
Over the trailing 12 months, 13 insiders reported transactions in RMBS stock across 38 Form 4 filings.
These insider figures for Rambus are based on Form 4 filings through October 5, 2026.

Form 4 Holdings

Insiders Holding RMBS

Insiders 17

Shares held 914.17K

Of outstanding 0.843%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Luc Seraphin	President And Ceo	345,767	0	345,767	37.8%	03 Apr, 2026
2	Xianzhi Sean Fan	Evp, Coo	168,358	0	168,358	18.4%	26 May, 2026
3	Desmond Lynch	Svp, Cfo	63,618	0	63,618	7.0%	24 Feb, 2026
4	Keith A Jones	Principal Accounting Officer	54,719	0	54,719	6.0%	02 Mar, 2022
5	Sanjay Saraf	Director	50,241	0	50,241	5.5%	04 Apr, 2022
6	Emiko Higashi	Director	49,519	0	49,519	5.4%	03 Jun, 2026
7	Sumeet Gagneja	Svp, Cfo	41,320	0	41,320	4.5%	04 May, 2026
8	John Shinn	Svp, General Counsel	21,112	0	21,112	2.3%	26 May, 2026
9	Meera Rao	Director	19,974	0	19,974	2.2%	27 Apr, 2026
10	Eric B Stang	Director	0	19,218	19,218	2.1%	02 Jun, 2026
11	Necip Sayiner	Director	18,223	0	18,223	2.0%	03 Jun, 2026
12	Karen M Rogge	Director	17,364	0	17,364	1.9%	04 Apr, 2023
13	John K Allen	Chief Accounting Officer	17,131	0	17,131	1.9%	07 Apr, 2026
14	James A Mitarotonda	Director	13,946	0	13,946	1.5%	04 Apr, 2022
15	Steven Laub	Director	7,519	0	7,519	0.8%	11 May, 2026
16	Charles Kissner	Director	0	3,747	3,747	0.4%	05 Oct, 2026
17	Victor Peng	Director	2,391	0	2,391	0.3%	03 Apr, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,581 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Oct, 2026	Charles Kissner	Director	Disposed S	5,000	$111.00	$555.00K	3,747	Indirect
22 Sep, 2026	Charles Kissner	Director	Disposed S	5,000	$105.00	$525.00K	8,747	Indirect
07 Aug, 2026	Charles Kissner	Director	Disposed S	5,000	$100.92	$504.60K	13,747	Indirect
03 Jun, 2026	Necip Sayiner	Director	Disposed S	5,000	$170.15	$850.75K	18,223	Direct
02 Jun, 2026	Emiko Higashi	Director	Disposed S	5,000	$163.00	$815.00K	54,519	Direct
02 Jun, 2026	Emiko Higashi	Director	Disposed S	5,000	$158.00	$790.00K	49,519	Direct
01 Jun, 2026	Eric B Stang	Director	Disposed S	5,000	$146.00	$730.00K	19,218	Indirect
26 May, 2026	Emiko Higashi	Director	Disposed S	5,000	$157.57	$787.85K	59,519	Direct
26 May, 2026	Xianzhi Sean Fan	Evp, Coo	Disposed S	37,814	$151.69	$5.74Mn	168,458	Direct
22 May, 2026	John Shinn	Svp, General Counsel	Disposed S	1,000	$143.63	$143.63K	21,112	Direct
26 May, 2026	Xianzhi Sean Fan	Evp, Coo	Disposed S	100	$152.35	$15.24K	168,358	Direct
07 May, 2026	Steven Laub	Director	Disposed S	1,500	$125.52	$188.28K	7,519	Direct
08 May, 2026	Necip Sayiner	Director	Disposed S	9,824	$130.18	$1.28Mn	23,223	Direct
01 May, 2026	Sumeet Gagneja	Svp, Cfo	Acquired A	14,518	$0.00	$0	14,518	Direct
01 May, 2026	Sumeet Gagneja	Svp, Cfo	Acquired A	26,802	$0.00	$0	41,320	Direct
24 Apr, 2026	Meera Rao	Director	Disposed S	2,972	$150.30	$446.69K	19,974	Direct
14 Apr, 2026	Meera Rao	Director	Disposed S	8,538	$118.08	$1.01Mn	22,946	Direct
03 Apr, 2026	John K Allen	Chief Accounting Officer	Disposed F	1,131	$92.22	$104.30K	17,131	Direct
01 Apr, 2026	Luc Seraphin	President And Ceo	Acquired A	32,684	$0.00	$0	363,754	Direct
01 Apr, 2026	Necip Sayiner	Director	Acquired A	2,223	$0.00	$0	33,047	Direct

Showing 1 to 20 of 1,581 transactions